diff --git a/src/header.h b/src/header.h
index 3ecd521..fbd09ee 100644
--- a/src/header.h
+++ b/src/header.h
@@ -41,7 +41,7 @@
 // MQTT
 #define MQTT_HOST "mqtt.timovolkmann.de"
 #define MQTT_PORT 1883
-#define MQTT_DEVICE_ID "esp-sebastian
+#define MQTT_DEVICE_ID "esp-sebastian"
 #define MQTT_TOPIC_BASE_SUB "smartgarden/commands"
 #define MQTT_TOPIC_BASE_PUB "smartgarden/updates"
 #define MQTT_PATH_PUB MQTT_TOPIC_BASE_PUB "/" MQTT_DEVICE_ID "/"